fix(dropdown): fix tab selection and blur reset

[silviuaavram]

This PR aims to fix 2 issues:

1. On multiple selection and search, using Tab (and Shift+Tab) to select an item will keep the focus on the dropdown, unless the tabInMultipleSelection is set to true.
2. On single search, will prevent default Downshift reset behavior when there is a blur on input text.

These 2 issues should also be addressed in Downshift but we need them now, so will patch them now like this and will follow-up in Downshift later. Downshift should make sure that selection on blur works (now it just resets on blur). Also I am planning to add multiple selection to Downshift in the future.

Please provide input about implementation and naming.

Should close #1101.

[mnajdova]

The changes looks good, but I would suggest adding some unit tests for this. Also, please update the changelog as well!

[codecov]

Codecov Report

Merging #1118 into master will decrease coverage by 0.05%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master    #1118      +/-   ##
==========================================
- Coverage   82.05%   81.99%   -0.06%     
==========================================
  Files         724      724              
  Lines        8619     8626       +7     
  Branches     1234     1236       +2     
==========================================
+ Hits         7072     7073       +1     
- Misses       1530     1536       +6     
  Partials       17       17

Impacted Files	Coverage Δ
...ackages/react/src/components/Dropdown/Dropdown.tsx	53.38% <14.28%> (-0.76%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ab73163...5d085f9. Read the comment docs.

[bmdalex]

tabInMultipleSelection is not very descriptive; what about

• moveFocusOnTab
• moveFocusOnTabKey
• moveFocusOnTabPress
• moveFocusOnTabKeyPress

Or use other verbs instead of move, like release or yield.

What do you think?
@mnajdova @silviuavram

[bmdalex]

forgot this is something that needs to get in so I'm not blocking this PR, but pls consider the comments, especially the ones concerning changing the name of the props as we want to avoid having breaking changes

forgot this is something that needs to get in so I'm not blocking this PR, but pls consider the comments, especially the ones concerning changing the name of the props as we want to avoid having breaking changes